<template>
  <view>
    <my-search @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧的滚动视图区域 -->
      <scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}">
        <block v-for="(item, i) in cateList" :key="i">
          <view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChanged(i)">
            {{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!-- 右侧的滚动视图区域 -->
      <scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
          <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
          <view class="cate-lv3-list">
            <!-- 三级分类 Item 项 -->
            <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
              <!-- 图片 -->
              <image :src="item3.cat_icon" mode="widthFix"></image>
              <!-- 文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  export default {
    mixins: [badgeMix],
    data() {
      return {
        wh: 0,
        cateList: [],
        active: 0,
        cateLevel2: [],
        scrollTop:0
      }
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight-50
      this.getCateList()
    },
    methods: {
      async getCateList() {
        const {
          data: res
        } = await uni.$http.get("/api/public/v1/categories")
        if (res.meta.status !== 200) return uni.$showMsg()
        this.cateList = res.message
        this.cateLevel2 = res.message[0].children
      },
      activeChanged(i) {
        this.active = i
        this.cateLevel2 = this.cateList[i].children
      },
      gotoGoodsList(item3){
        uni.navigateTo({
          url:"/subpkg/goods_list/goods_list?cid="+item3.cat_id
        })
      },
      gotoSearch(){
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    }
  }
</script>

<style>
  .scroll-view-container {
    display: flex;
  }

  .left-scroll-view {
    width: 120px;
  }

  .left-scroll-view-item {
    line-height: 60px;
    background-color: #f7f7f7;
    text-align: center;
    font-size: 12px;
  }

  view.active {
    background-color: #ffffff;
    position: relative;
  }

  view.active::before {
    content: "";
    display: block;
    width: 3px;
    height: 40px;
    background-color: #c00000;
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
  }

  .cate-lv2-title {
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }
  .cate-lv3-list{
    display: flex;
    flex-wrap: wrap;
  }
  .cate-lv3-item{
    width: 33.33%;
    margin-bottom: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  image{
    width: 60px;
  }
  .cate-lv3-item text{
    font-size: 12px;
  }
</style>
